diff --git a/.travis.yml b/.travis.yml
index 85bddac7f3..6e67639284 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-# FTR: Configuration on https://travis-ci.org/vector-im/riotX-android/settings
+# FTR: Configuration on https://travis-ci.org/github/vector-im/element-android/settings
 #
 # - Build only if .travis.yml is present -> On
 # - Limit concurrent jobs                -> Off
@@ -8,53 +8,11 @@
 # - Auto cancel branch builds            -> On
 # - Auto cancel pull request builds      -> On
 
-language: android
-jdk: oraclejdk8
 sudo: false
 
 notifications:
   email: false
 
-android:
-  components:
-    # Uncomment the lines below if you want to
-    # use the latest revision of Android SDK Tools
-    - tools
-    - platform-tools
-
-    # The BuildTools version used by your project
-    - build-tools-29.0.3
-
-    # The SDK version used to compile your project
-    - android-29
-
-before_cache:
-  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
-
-cache:
-  directories:
-    - $HOME/.gradle/caches/
-    - $HOME/.gradle/wrapper/
-    - $HOME/.android/build-cache
-
-# Build with the development SDK
-before_script:
-  # Not necessary for the moment
-  # - /bin/sh ./set_debug_env.sh
-
-# Just build the project for now
+# Just run a simple script here
 script:
-  # Build app (assembleGplayRelease assembleFdroidRelease)
-  # Build Android test (assembleAndroidTest) (disabled for now)
-  # Code quality (lintGplayRelease lintFdroidRelease)
-  # Split into two steps because if a task contain Fdroid, PlayService will be disabled
-  # Done by Buildkite now: - ./gradlew clean assembleGplayRelease lintGplayRelease --stacktrace
-  # Done by Buildkite now: - ./gradlew clean assembleFdroidRelease lintFdroidRelease --stacktrace
-  # Run unitary test (Disable for now, see https://travis-ci.org/vector-im/riot-android/builds/502504370)
-  # - ./gradlew testGplayReleaseUnitTest --stacktrace
-  # Other code quality check
-  # Done by Buildkite now: - ./tools/check/check_code_quality.sh
   - ./tools/travis/check_pr.sh
-  # Check that indonesians file are identical. Due to Android issue, the resource folder must be value-in/, and Weblate export data into value-id/.
-  # Done by Buildkite now: - diff ./vector/src/main/res/values-id/strings.xml ./vector/src/main/res/values-in/strings.xml
diff --git a/CHANGES.md b/CHANGES.md
index d00bd7cd75..0fcfabf2ed 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -8,7 +8,7 @@ Improvements 🙌:
  -
 
 Bugfix 🐛:
- -
+ - Fix a problem with database migration on nightly builds (#3335)
 
 Translations 🗣:
  -
@@ -19,12 +19,13 @@ SDK API changes ⚠️:
 Build 🧱:
  - Compile with Kotlin 1.5.
  - Upgrade some dependencies: gradle wrapper, third party lib, etc.
+ - Sign APK with build tools 30.0.3
 
 Test:
  -
 
 Other changes:
- -
+ - Add documentation on LoginWizard and RegistrationWizard (#3303)
 
 Changes in Element 1.1.7 (2021-05-12)
 ===================================================
diff --git a/matrix-sdk-android/build.gradle b/matrix-sdk-android/build.gradle
index 451d56970a..a65dc6298e 100644
--- a/matrix-sdk-android/build.gradle
+++ b/matrix-sdk-android/build.gradle
@@ -9,7 +9,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath "io.realm:realm-gradle-plugin:10.4.0"
+        classpath "io.realm:realm-gradle-plugin:10.5.0"
     }
 }
 
@@ -169,7 +169,7 @@ dependencies {
     implementation 'com.otaliastudios:transcoder:0.10.3'
 
     // Phone number https://github.com/google/libphonenumber
-    implementation 'com.googlecode.libphonenumber:libphonenumber:8.12.22'
+    implementation 'com.googlecode.libphonenumber:libphonenumber:8.12.23'
 
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.robolectric:robolectric:4.5.1'
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/AuthenticationService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/AuthenticationService.kt
index a7f5163774..5e35917243 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/AuthenticationService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/AuthenticationService.kt
@@ -51,11 +51,15 @@ interface AuthenticationService {
 
     /**
      * Return a LoginWizard, to login to the homeserver. The login flow has to be retrieved first.
+     *
+     * See [LoginWizard] for more details
      */
     fun getLoginWizard(): LoginWizard
 
     /**
      * Return a RegistrationWizard, to create an matrix account on the homeserver. The login flow has to be retrieved first.
+     *
+     * See [RegistrationWizard] for more details.
      */
     fun getRegistrationWizard(): RegistrationWizard
 
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/login/LoginWizard.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/login/LoginWizard.kt
index 9c96cba40c..da6eb0c3ac 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/login/LoginWizard.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/login/LoginWizard.kt
@@ -17,34 +17,46 @@
 package org.matrix.android.sdk.api.auth.login
 
 import org.matrix.android.sdk.api.session.Session
-import org.matrix.android.sdk.api.util.Cancelable
 
+/**
+ * Set of methods to be able to login to an existing account on a homeserver.
+ *
+ * More documentation can be found in the file https://github.com/vector-im/element-android/blob/main/docs/signin.md
+ */
 interface LoginWizard {
-
     /**
-     * @param login the login field
-     * @param password the password field
+     * Login to the homeserver.
+     *
+     * @param login the login field. Can be a user name, or a msisdn (email or phone number) associated to the account
+     * @param password the password of the account
      * @param deviceName the initial device name
-     * @param callback  the matrix callback on which you'll receive the result of authentication.
-     * @return a [Cancelable]
+     * @return a [Session] if the login is successful
      */
     suspend fun login(login: String,
                       password: String,
                       deviceName: String): Session
 
     /**
-     * Exchange a login token to an access token
+     * Exchange a login token to an access token.
+     *
+     * @param loginToken login token, obtain when login has happen in a WebView, using SSO
+     * @return a [Session] if the login is successful
      */
     suspend fun loginWithToken(loginToken: String): Session
 
     /**
-     * Reset user password
+     * Ask the homeserver to reset the user password. The password will not be reset until
+     * [resetPasswordMailConfirmed] is successfully called.
+     *
+     * @param email an email previously associated to the account the user wants the password to be reset.
+     * @param newPassword the desired new password
      */
     suspend fun resetPassword(email: String,
                               newPassword: String)
 
     /**
      * Confirm the new password, once the user has checked their email
+     * When this method succeed, tha account password will be effectively modified.
      */
     suspend fun resetPasswordMailConfirmed()
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/registration/RegistrationWizard.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/registration/RegistrationWizard.kt
index f059bf26c4..621253faa5 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/registration/RegistrationWizard.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/auth/registration/RegistrationWizard.kt
@@ -16,32 +16,98 @@
 
 package org.matrix.android.sdk.api.auth.registration
 
+/**
+ * Set of methods to be able to create an account on a homeserver.
+ *
+ * Common scenario to register an account successfully:
+ *  - Call [getRegistrationFlow] to check that you application supports all the mandatory registration stages
+ *  - Call [createAccount] to start the account creation
+ *  - Fulfill all mandatory stages using the methods [performReCaptcha] [acceptTerms] [dummy], etc.
+ *
+ * More documentation can be found in the file https://github.com/vector-im/element-android/blob/main/docs/signup.md
+ * and https://matrix.org/docs/spec/client_server/latest#account-registration-and-management
+ */
 interface RegistrationWizard {
-
+    /**
+     * Call this method to get the possible registration flow of the current homeserver.
+     * It can be useful to ensure that your application implementation supports all the stages
+     * required to create an account. If it is not the case, you will have to use the web fallback
+     * to let the user create an account with your application.
+     * See [org.matrix.android.sdk.api.auth.AuthenticationService.getFallbackUrl]
+     */
     suspend fun getRegistrationFlow(): RegistrationResult
 
+    /**
+     * Can be call to check is the desired userName is available for registration on the current homeserver.
+     * It may also fails if the desired userName is not correctly formatted or does not follow any restriction on
+     * the homeserver. Ex: userName with only digits may be rejected.
+     * @param userName the desired username. Ex: "alice"
+     */
+    suspend fun registrationAvailable(userName: String): RegistrationAvailability
+
+    /**
+     * This is the first method to call in order to create an account and start the registration process.
+     *
+     * @param userName the desired username. Ex: "alice"
+     * @param password the desired password
+     * @param initialDeviceDisplayName the device display name
+     */
     suspend fun createAccount(userName: String?,
                               password: String?,
                               initialDeviceDisplayName: String?): RegistrationResult
 
+    /**
+     * Perform the "m.login.recaptcha" stage.
+     *
+     * @param response the response from ReCaptcha
+     */
     suspend fun performReCaptcha(response: String): RegistrationResult
 
+    /**
+     * Perform the "m.login.terms" stage.
+     */
     suspend fun acceptTerms(): RegistrationResult
 
+    /**
+     * Perform the "m.login.dummy" stage.
+     */
     suspend fun dummy(): RegistrationResult
 
+    /**
+     * Perform the "m.login.email.identity" or "m.login.msisdn" stage.
+     *
+     * @param threePid the threePid to add to the account. If this is an email, the homeserver will send an email
+     * to validate it. For a msisdn a SMS will be sent.
+     */
     suspend fun addThreePid(threePid: RegisterThreePid): RegistrationResult
 
+    /**
+     * Ask the homeserver to send again the current threePid (email or msisdn).
+     */
     suspend fun sendAgainThreePid(): RegistrationResult
 
+    /**
+     * Send the code received by SMS to validate a msisdn.
+     * If the code is correct, the registration request will be executed to validate the msisdn.
+     */
     suspend fun handleValidateThreePid(code: String): RegistrationResult
 
+    /**
+     * Useful to poll the homeserver when waiting for the email to be validated by the user.
+     * Once the email is validated, this method will return successfully.
+     * @param delayMillis the SDK can wait before sending the request
+     */
     suspend fun checkIfEmailHasBeenValidated(delayMillis: Long): RegistrationResult
 
-    suspend fun registrationAvailable(userName: String): RegistrationAvailability
-
+    /**
+     * This is the current ThreePid, waiting for validation. The SDK will store it in database, so it can be
+     * restored even if the app has been killed during the registration
+     */
     val currentThreePid: String?
 
-    // True when login and password has been sent with success to the homeserver
+    /**
+     * True when login and password have been sent with success to the homeserver, i.e. [createAccount] has been
+     * called successfully.
+     */
     val isRegistrationStarted: Boolean
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/Room.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/Room.kt
index f3eeb902a8..8c434fc440 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/Room.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/Room.kt
@@ -83,7 +83,7 @@ interface Room :
      * @param beforeLimit how many events before the result are returned.
      * @param afterLimit how many events after the result are returned.
      * @param includeProfile requests that the server returns the historic profile information for the users that sent the events that were returned.
-     * @param callback Callback to get the search result
+     * @return The search result
      */
     suspend fun search(searchTerm: String,
                nextBatch: String?,
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt
index 211059a345..d810c8b1a8 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt
@@ -44,7 +44,7 @@ import javax.inject.Inject
 class RealmSessionStoreMigration @Inject constructor() : RealmMigration {
 
     companion object {
-        const val SESSION_STORE_SCHEMA_VERSION = 12L
+        const val SESSION_STORE_SCHEMA_VERSION = 13L
     }
 
     override fun migrate(realm: DynamicRealm, oldVersion: Long, newVersion: Long) {
@@ -62,6 +62,7 @@ class RealmSessionStoreMigration @Inject constructor() : RealmMigration {
         if (oldVersion <= 9) migrateTo10(realm)
         if (oldVersion <= 10) migrateTo11(realm)
         if (oldVersion <= 11) migrateTo12(realm)
+        if (oldVersion <= 12) migrateTo13(realm)
     }
 
     private fun migrateTo1(realm: DynamicRealm) {
@@ -274,4 +275,14 @@ class RealmSessionStoreMigration @Inject constructor() : RealmMigration {
                 ?.addField(SpaceChildSummaryEntityFields.SUGGESTED, Boolean::class.java)
                 ?.setNullable(SpaceChildSummaryEntityFields.SUGGESTED, true)
     }
+
+    private fun migrateTo13(realm: DynamicRealm) {
+        Timber.d("Step 12 -> 13")
+
+        // Fix issue with the nightly build. Eventually play again the migration which has been included in migrateTo12()
+        realm.schema.get("SpaceChildSummaryEntity")
+                ?.takeIf { !it.hasField(SpaceChildSummaryEntityFields.SUGGESTED) }
+                ?.addField(SpaceChildSummaryEntityFields.SUGGESTED, Boolean::class.java)
+                ?.setNullable(SpaceChildSummaryEntityFields.SUGGESTED, true)
+    }
 }
diff --git a/tools/release/sign_apk.sh b/tools/release/sign_apk.sh
index 77af5823c4..7697f58ceb 100755
--- a/tools/release/sign_apk.sh
+++ b/tools/release/sign_apk.sh
@@ -17,7 +17,7 @@ PARAM_KEYSTORE_PATH=$1
 PARAM_APK=$2
 
 # Other params
-BUILD_TOOLS_VERSION="29.0.3"
+BUILD_TOOLS_VERSION="30.0.3"
 MIN_SDK_VERSION=21
 
 echo "Signing APK with build-tools version ${BUILD_TOOLS_VERSION} for min SDK version ${MIN_SDK_VERSION}..."
diff --git a/tools/release/sign_apk_unsafe.sh b/tools/release/sign_apk_unsafe.sh
index b145ad45da..af5b0f0e32 100755
--- a/tools/release/sign_apk_unsafe.sh
+++ b/tools/release/sign_apk_unsafe.sh
@@ -23,7 +23,7 @@ PARAM_KS_PASS=$3
 PARAM_KEY_PASS=$4
 
 # Other params
-BUILD_TOOLS_VERSION="29.0.3"
+BUILD_TOOLS_VERSION="30.0.3"
 MIN_SDK_VERSION=21
 
 echo "Signing APK with build-tools version ${BUILD_TOOLS_VERSION} for min SDK version ${MIN_SDK_VERSION}..."
diff --git a/vector/build.gradle b/vector/build.gradle
index ff777b6769..a9a8ba0924 100644
--- a/vector/build.gradle
+++ b/vector/build.gradle
@@ -326,7 +326,7 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation "androidx.sharetarget:sharetarget:1.1.0"
     implementation 'androidx.core:core-ktx:1.3.2'
-    implementation "androidx.media:media:1.3.0"
+    implementation "androidx.media:media:1.3.1"
 
     implementation "org.threeten:threetenbp:1.4.0:no-tzdb"
     implementation "com.gabrielittner.threetenbp:lazythreetenbp:0.9.0"
@@ -343,7 +343,7 @@ dependencies {
     implementation 'com.facebook.stetho:stetho:1.6.0'
 
     // Phone number https://github.com/google/libphonenumber
-    implementation 'com.googlecode.libphonenumber:libphonenumber:8.12.22'
+    implementation 'com.googlecode.libphonenumber:libphonenumber:8.12.23'
 
     // rx
     implementation 'io.reactivex.rxjava2:rxkotlin:2.4.0'
diff --git a/vector/src/main/java/im/vector/app/core/utils/ExternalApplicationsUtil.kt b/vector/src/main/java/im/vector/app/core/utils/ExternalApplicationsUtil.kt
index 005ea362a6..d82de1b4ed 100644
--- a/vector/src/main/java/im/vector/app/core/utils/ExternalApplicationsUtil.kt
+++ b/vector/src/main/java/im/vector/app/core/utils/ExternalApplicationsUtil.kt
@@ -512,7 +512,7 @@ fun selectTxtFileToWrite(
  * @param sourceFile     the file source path
  * @param dstDirPath     the dst path
  * @param outputFilename optional the output filename
- * @param callback       the asynchronous callback
+ * @return               the created file
  */
 @Suppress("DEPRECATION")
 fun saveFileIntoLegacy(sourceFile: File, dstDirPath: File, outputFilename: String?): File? {